1981-11-20
1985-02-19
Rubinson, Gene Z.
179 81A, H04B 158
Patent
active
045007551
ABSTRACT:
A hybrid circuit has its 4-wire path input coupled via a resistor to a 2-wire port and a non-inverting input of a differential amplifier, and via an active stage and another resistor to an inverting input of the differential amplifier, whose output is coupled to a 4-wire path output of the circuit and via a resistor to the inverting input. The active stage includes impedances, constituting a feedback arrangement or an input potential divider arrangement of an amplifier, which enable the hybrid circuit sidetone to be controlled or made substantially zero, without affecting the circuit's receive gain, even when the circuit is connected to a 2-wire path having a complex impedance.
REFERENCES:
patent: 2629024 (1953-02-01), Edwards
patent: 3970805 (1976-07-01), Thomas
patent: 4163878 (1979-08-01), Hashemi
patent: 4203005 (1980-05-01), Fukuda et al.
patent: 4292479 (1981-09-01), Chataignon et al.
Haley R. John
Myers Randall P.
Northern Telecom Limited
Rubinson Gene Z.
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